Thank you Chrisir for your answer.
I actually prefer any Linux board (Raspberry, Beaglebone, oodo, wanderboard, etc) over Arduino to be able to code Python.
However, I 've already wired 3 strips to my PI so this SPI part is working, the main thing for me is to be able to make Processing talk to the Strips .
With these strips behaving independantly as slaves
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